add (overwrite with) mypy stubs, if available

stdlib/3/getopt.pyi

@@ -0,0 +1,19 @@
+# Stubs for getopt
+
+# Based on http://docs.python.org/3.2/library/getopt.html
+
+from typing import List, Tuple
+
+def getopt(args: List[str], shortopts: str,
+           longopts: List[str]) -> Tuple[List[Tuple[str, str]],
+                                         List[str]]: ...
+
+def gnu_getopt(args: List[str], shortopts: str,
+               longopts: List[str]) -> Tuple[List[Tuple[str, str]],
+                                             List[str]]: ...
+
+class GetoptError(Exception):
+    msg = ''
+    opt = ''
+
+error = GetoptError